Development of Affordable and Durable Next-Generation Light-Emitting Device 'Tandem Perovskite'

Professor Tae-Woo Lee's Research Team at Seoul National University
Combines Advantages of Metal Halide Perovskites and Organic Light-Emitting Materials

Highly efficient tandem perovskite light-emitting devices, expected to be next-generation displays, have been developed for the first time in the world by a domestic research team. These devices also possess the advantages of organic light-emitting diodes (OLEDs), raising expectations for future advancements.

Professor Lee Tae-woo, Seoul National University

The Ministry of Science and ICT announced on the 16th that Professor Tae-Woo Lee's research team at Seoul National University succeeded in developing a high-efficiency, long-lifetime hybrid tandem light-emitting device combining metal halide perovskite and organic light-emitting materials.

Perovskite is mainly used as a solar cell material, but due to its excellent electrical properties and color purity at a low cost, it is emerging as a next-generation display material. The problem has been its lower efficiency compared to OLEDs, but the research team solved this by creating a perovskite nanocrystal single device through a solution process and then fabricating an organic light-emitting single device on top via a deposition process, developing a new design.

Through optical simulations, the researchers found a device structure that simultaneously achieves high efficiency and high color purity, naming it the "hybrid-tandem valley."

This device can operate for 5,596 hours at 100 nits (nit, a unit of luminance), which is more than 3,000 times longer than perovskite devices that cannot last even two hours, making it advantageous for commercialization, according to the research team.

Professor Lee said, "We will challenge the realization of full-color hybrid tandem displays by developing not only green but also blue and red hybrid perovskite tandem devices." The research results were published in the international journal Nature Nanotechnology on the same day.